Granted Patent
Utility
US 4,274,040 · App. 06/089,554
Solenoid torquer system
Inventor:
Leo Spiegel
Patented Case
View Patent ↗
Granted: Jun 16, 1981
Filed: Oct 29, 1979
Inventor
Leo Spiegel
Assignee (at issue)
Northrop Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.